ABCD

Example

A
B
C
20
B
B
C
_
C
A
C
24
_
16
27
 
 
A
B
C
_
_
_

Solution

A
B
C
20
B
B
C
19
C
A
C
24
20
16
27
 
 
A
B
C
6
5
9
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ABCD
ABCD

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